Characteristic Relationships

Hi Gurus,

I'm trying to create a characteristic relationhip of 'derivation, combination check and proposal', at the Planning area level.

But in the pull-down window where you define the 'Basic characteristic' I only see a few to choose from and not the one I want. For example I only see a couple of them.

What determines what appears in the pull-down window, and how can i make sure the characteristic that I want appears there and is available to choose from, and it's available attribute?

Does this have to be defined at the cube level?

Thanks all.